Maxwell, Grover. 1962. The ontological status of theoretical entities. In Minnesota Studies in the Philosophy of Science. Minneapolis: University of Minnesota Press.
Putnam, Hilary. 1962. What theories are not. In Logic, Methodology, and Philosophy of Science, ed. by E. Nagel, P. Suppes and A. Tarski. Stanford: Stanford University Press.
Saatsi, Juha. 2011. The enhanced indispensability argument: representational versus explanatory role of mathematics in science. British Journal for the Philosophy of Science 62: 143–54.10.1093/bjps/axq029